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Comment by Disargeria

It may not seem useful at first, but this greatly improves Renewing Mist's effectiveness for a raid or battleground group that is spread out. In the worst case scenario, it'll still find itself an ally in need of healing, but it can do so from farther away without needing to cross smaller gaps.

I don't think most players will notice any difference in effectiveness on the healing meters, though.

Comment by defektunge

This is basically just an increase to the distance that Renewing Mists can jump, which is very useful if your group or raid is spread out. The spell will seek out injured targets as its top priority, then worry about range, so the "most distant" thing is mostly cosmetic (it's only relevant if everyone is on full health). Admittedly, it does look pretty neat as you can see the spell effect as it travels between players, but the reason to get the glyph is the increased jump distance.